Fig. 5. A in Size-shape relationships in the Mesozoic planispiral ammonites

Fig. 5. A. Reduced morphospace RM1. Plot of individual measurements (gray points, N = 1222) and mean values for the 201 species studied classified by morphotypes. The theoretical iso−U/D curves are explained in text. The gray trapezoid−like area is delimited by curves as explained in text. The bold broken curve shows the main trend H1/D = 0.3/(H2/H1). The two thinner curves [H1/D = 0.5/(H2/H1) and H1/D = 0.1/(H2/H1)] delimit the constrained empirical morphospace CM1, the portion of RM1 realised or occupied by Mesozoic ammonoids. B. Reduced morphospace RM2 with plots of individual measurements (N = 1222) in gray points, and mean values of each one of the 201 species studied. The general trend is represented by two straight lines as described in the text.